Well, honey, you're gonna need 20 short isosceles triangles to build that fabulous Icosahedron. Each face of the Icosahedron is made up of an isosceles triangle, and there are 20 faces in total. So, do the math and get building, darling!
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According to some definitions an icosahedron is considered a Platonic solid so that each of its faces is an equilateral triangle. You would, therefore need three coplanar isosceles triangles to make each face of the icosahedron. Since there are 20 faces in an icosahedron, you would need 60 such triangles.
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You've got to build a 3 dimensional triangle. Lay the first three matches flat on the table touching one another in the shape of a triangle, then put the remaining three matches at each of the corners of the original three matches so that the second set of three meet together at the apex above the original three matches. Visually, it would take the shape of a pyramid. That will give you four equal triangles.
It was used by pushing the blocks up to the spot they needed. It helped make it easier then carrying it to the top
well I would say at least 20 at least,and it needs to be reasonably flat but it really depends on the sort of plane you are flying.